Nokia 447ZiPlus Service Manual page 35

(8) MICRO CONTROL FUNCTION ABNORMAL
(9)HORIZONTAL WIDTH CONTROL ABNORMAL
MICRO CONTROL
ABNORMAL
Is the
No
control function
working ?
Yes
PWB-0171
key control board
H. SIZE ABNORMAL
Is H.size
No
control function
working
Yes
Check
Q408, Q408A, Q502
Is the sync
signal on Pin
39/40 normal
?
Yes
Check 5V on Pin 5 of I501
Check X510, D506, C506
Is voltage at
No
the base of
Q467 normal
?
Yes
Check Q467, Q468,
Q470, C471, L471
33
No
Check Q550,
Q556
Check Q502, I501